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.TH "CEPH-MDS" "8" "March 07, 2017" "dev" "Ceph"
.SH NAME
ceph-mds \- ceph metadata server daemon
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.SH SYNOPSIS
.nf
\fBceph\-mds\fP \-i \fIname\fP [[ \-\-hot\-standby [\fIrank\fP] ]|[\-\-journal_check \fIrank\fP]]
.fi
.sp
.SH DESCRIPTION
.sp
\fBceph\-mds\fP is the metadata server daemon for the Ceph distributed file
system. One or more instances of ceph\-mds collectively manage the file
system namespace, coordinating access to the shared OSD cluster.
.sp
Each ceph\-mds daemon instance should have a unique name. The name is used
to identify daemon instances in the ceph.conf.
.sp
Once the daemon has started, the monitor cluster will normally assign
it a logical rank, or put it in a standby pool to take over for
another daemon that crashes. Some of the specified options can cause
other behaviors.
.sp
If you specify hot\-standby or journal\-check, you must either specify
the rank on the command line, or specify one of the
mds_standby_for_[rank|name] parameters in the config.  The command
line specification overrides the config, and specifying the rank
overrides specifying the name.
.SH OPTIONS
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.TP
.B \-f, \-\-foreground
Foreground: do not daemonize after startup (run in foreground). Do
not generate a pid file. Useful when run via \fBceph\-run\fP(8).
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.TP
.B \-d
Debug mode: like \fB\-f\fP, but also send all log output to stderr.
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.TP
.B \-\-setuser userorgid
Set uid after starting.  If a username is specified, the user
record is looked up to get a uid and a gid, and the gid is also set
as well, unless \-\-setgroup is also specified.
.UNINDENT
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.TP
.B \-\-setgroup grouporgid
Set gid after starting.  If a group name is specified the group
record is looked up to get a gid.
.UNINDENT
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.TP
.B \-c ceph.conf, \-\-conf=ceph.conf
Use \fIceph.conf\fP configuration file instead of the default
\fB/etc/ceph/ceph.conf\fP to determine monitor addresses during
startup.
.UNINDENT
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.TP
.B \-m monaddress[:port]
Connect to specified monitor (instead of looking through
\fBceph.conf\fP).
.UNINDENT
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.TP
.B \-\-journal\-check <rank>
Attempt to replay the journal for MDS <rank>, then exit.
.UNINDENT
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.TP
.B \-\-hot\-standby <rank>
Start as a hot standby for MDS <rank>.
.UNINDENT
.SH AVAILABILITY
.sp
\fBceph\-mds\fP is part of Ceph, a massively scalable, open\-source, distributed storage system. Please refer to the Ceph documentation at
\fI\%http://ceph.com/docs\fP for more information.
.SH SEE ALSO
.sp
\fBceph\fP(8),
\fBceph\-mon\fP(8),
\fBceph\-osd\fP(8)
.SH COPYRIGHT
2010-2014, Inktank Storage, Inc. and contributors. Licensed under Creative Commons BY-SA
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